annotate mod_firewall/README.markdown @ 4651:8231774f5bfd

mod_cloud_notify_encrypted: Ensure body substring remains valid UTF-8 The `body:sub()` call risks splitting the string in the middle of a multi-byte UTF-8 sequence. This should have been caught by util.stanza validation, but that would have caused some havoc, at the very least causing the notification to not be sent. There have been no reports of this happening. Likely because this module isn't widely deployed among users with languages that use many longer UTF-8 sequences. The util.encodings.utf8.valid() function is O(n) where only the last sequence really needs to be checked, but it's in C and expected to be fast.
author Kim Alvefur <zash@zash.se>
date Sun, 22 Aug 2021 13:22:59 +0200
parents bb8459c220c9
children d7684aa81d8f
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1 ---
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2 labels:
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3 - 'Stage-Alpha'
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4 summary: 'A rule-based stanza filtering module'
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5 rockspec:
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6 build:
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7 modules:
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8 mod_firewall.actions: actions.lib.lua
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9 mod_firewall.conditions: conditions.lib.lua
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10 mod_firewall.definitions: definitions.lib.lua
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11 mod_firewall.marks: marks.lib.lua
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12 mod_firewall.test: test.lib.lua
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13 ---
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15 ------------------------------------------------------------------------
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16
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17 **Note:** mod\_firewall is in its very early stages. This documentation
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18 is liable to change, and some described functionality may be missing,
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19 incomplete or contain bugs.
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21 ------------------------------------------------------------------------
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22
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23 Introduction
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24 ============
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26 A firewall is an invaluable tool in the sysadmin's toolbox. However
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27 while low-level firewalls such as iptables and pf are incredibly good at
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28 what they do, they are generally not able to handle application-layer
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29 rules.
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30
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31 The goal of mod\_firewall is to provide similar services at the XMPP
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32 layer. Based on rule scripts it can efficiently block, bounce, drop,
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33 forward, copy, redirect stanzas and more! Furthermore all rules can be
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34 applied and updated dynamically at runtime without restarting the
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35 server.
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36
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37 Details
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38 =======
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39
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40 mod\_firewall loads one or more scripts, and compiles these to Lua code
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41 that reacts to stanzas flowing through Prosody. The firewall script
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42 syntax is unusual, but straightforward.
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43
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44 A firewall script is dominated by rules. Each rule has two parts:
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45 conditions, and actions. When a stanza matches all of the conditions,
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46 all of the actions are executed in order.
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47
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48 Here is a simple example to block stanzas from spammer@example.com:
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49
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50 FROM: spammer@example.com
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51 DROP.
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52
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53 FROM is a condition, and DROP is an action. This is about as simple as
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54 it gets. How about heading to the other extreme? Let's demonstrate
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55 something more complex that mod\_firewall can do for you:
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56
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57 %ZONE myorganisation: staff.myorg.example, support.myorg.example
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58
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59 ENTERING: myorganisation
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60 KIND: message
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61 TIME: 12am-9am, 5pm-12am, Saturday, Sunday
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62 REPLY=Sorry, I am afraid our office is closed at the moment. If you need assistance, please call our 24-hour support line on 123-456-789.
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63
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64 This rule will reply with a short message whenever someone tries to send
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65 a message to someone at any of the hosts defined in the 'myorganisation'
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66 outside of office hours.
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67
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68 Specifying rule sets
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69 --------------------
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70
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71 Firewall rules should be written into text files, e.g. `ruleset.pfw` file.
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72 One or more rule files can be specified in the configuration using:
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74 firewall_scripts = { "path/to/ruleset.pfw", "path/to/ruleset2.pfw" }
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75
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76 If multiple files are specified and they both add rules to the same [chains](#chains),
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77 each file's rules will be processed in order, but the order of files is undefined.
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78
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79 Reloading Prosody's configuration also reloads firewall rules.
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80
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81 Make sure that `firewall_scripts` is in the global section of the configuration file
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82 and not below a virtual host or a component - unless you want per-vhost
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83 firewall rules.
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84
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85 Conditions
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86 ----------
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87
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88 All conditions must come before any action in a rule block. The
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89 condition name is followed by a colon (':'), and the value to test for.
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90
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91 A condition can be preceded or followed by `NOT` to negate its match.
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92 For example:
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93
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94 NOT FROM: user@example.com
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95 KIND NOT: message
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96
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97 Some conditions do not take parameters, and these should end with just a
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98 question mark, like:
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99
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100 IN ROSTER?
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101
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102 ### Zones
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103
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104 A 'zone' is one or more hosts or JIDs. It is possible to match when a
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105 stanza is entering or leaving a zone, while at the same time not
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106 matching traffic passing between JIDs in the same zone.
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107
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108 Zones are defined at the top of a script with the following syntax (they
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109 are not part of a rule block):
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110
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111 %ZONE myzone: host1, host2, user@host3, foo.bar.example
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112
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113 There is an automatic zone named `$local`, which automatically includes
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114 all of the current server's active hosts (including components). It can
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115 be used to match stanzas entering or leaving the current server.
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116
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117 A host listed in a zone also matches all users on that host (but not
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118 subdomains).
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119
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120 The following zone-matching conditions are supported:
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121
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122 Condition Matches
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123 ------------ ------------------------------------------
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124 `ENTERING` When a stanza is entering the named zone
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125 `LEAVING` When a stanza is leaving the named zone
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126
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127 ### Lists
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128
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129 It is possible to create or load lists of strings for use in scripts. For
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130 example, you might load a list of blocked JIDs, malware URLs or simple words
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131 that you want to filter messages on.
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132
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133 List type Example
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134 ----------- -----------------------
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135 memory %LIST spammers: memory
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136 file %LIST spammers: file:/etc/spammers.txt
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137 http %LIST spammers: http://example.com/spammers.txt
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138
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139 #### List types
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140 ##### memory
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141
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142 ```
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143 %LIST name: memory (limit: number)
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144 ```
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145
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146 A memory-only list, with an optional limit. Supports addition and removal of items by scripts.
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147
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148 If a limit is provided, the oldest item will be discarded to make room for a new item if the
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149 list is full. The limit is useful to prevent infinite memory growth on busy servers.
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150
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151 ##### file
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152
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153 ```
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154 %LIST name: file:/path/to/file (missing: string)
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155 ```
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156
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157 Reads a list from a file. The list can be added to and removed from by scripts, but
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158 these changes do not persist between restarts.
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159
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160 If the file is missing, an error will be raised. The optional 'missing' parameter can be set
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161 to 'ignore' (e.g. `(missing: ignore)`) to ignore a missing file.
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162
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163 ##### http
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164
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165 ```
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166 %LIST name: http://example.com/ (ttl: number, pattern: pat, hash: sha1, checkcerts: when-sni)
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167 ```
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168
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169 Fetches a list from a HTTP or HTTPS URL. The following options are accepted:
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170
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171 Option Description
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172 ------- -----------
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173 ttl Seconds to cache the list for. After expiry, it will be refetched. Default 3600 (1 hour).
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174 pattern Optional pattern used to extract list entries from the response. Default is to treat each line as a single item.
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175 hash Optional hash to be applied to items before looking them up in the list, e.g. sha1 or sha256.
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176 checkcert Whether to verify HTTPS certificates. May be "always", "never" or "when-sni". Default "when-sni".
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177
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178 The "when-sni" default disables certificate verification when Prosody's HTTP client API doesn't support SNI,
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179 as in Prosody 0.11.6 and earlier.
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180
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181 #### CHECK LIST
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182
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183 Checks whether a simple [expression](#expressions) is found in a given list.
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184
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185 Example:
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186
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187 %LIST blocked_jids: file:/etc/prosody/blocked_jids.txt
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188
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189 # Rule to block presence subscription requests from blocked JIDs
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190 KIND: presence
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191 TYPE: subscribe
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192 CHECK LIST: blocked_jids contains $<@from>
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193 BOUNCE=policy-violation (Your JID is blocked)
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194
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195 #### SCAN
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196
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197 SCAN allows you to search inside a stanza for a given pattern, and check each result against a list. For example,
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198 you could scan a message body for words and check if any of the words are found in a given list.
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199
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200 Before using SCAN, you need to define a search location and a pattern. The search location uses the same 'path'
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201 format as documented under the 'INSPECT' condition. Patterns can be any valid Lua pattern.
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202
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203 To use the above example:
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204
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205 # Define a search location called 'body' which fetches the text of the 'body' element
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206 %SEARCH body: body#
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207 # Define a pattern called 'word' which matches any sequence of letters
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208 %PATTERN word: [A-Za-z]+
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209 # Finally, we also need our list of "bad" words:
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210 %LIST badwords: file:/etc/prosody/bad_words.txt
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211
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212 # Now we can use these to SCAN incoming stanzas
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213 # If it finds a match, bounce the stanza
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214 SCAN: body for word in badwords
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215 BOUNCE=policy-violation (This word is not allowed!)
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216
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217 #### COUNT
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218
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219 COUNT is similar to SCAN, in that it uses a defined SEARCH and breaks it up according to a PATTERN. Then it
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220 counts the number of results.
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221
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222 For example, to block every message with more than one URL:
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223
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224 # Define a search location called 'body' which fetches the text of the 'body' element
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225 %SEARCH body: body#
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226 # Define a pattern called 'url' which matches HTTP links
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227 %PATTERN url: https?://%S+
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228
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229 COUNT: url in body > 1
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230 BOUNCE=policy-violation (Up to one HTTP URL is allowed in messages)
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231
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232 ### Stanza matching
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233
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234 Condition Matches
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235 ----------- ------------------------------------------------------------------------------------------------------------------------------------------------------------
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236 `KIND` The kind of stanza. May be 'message', 'presence' or 'iq'
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237 `TYPE` The type of stanza. This varies depending on the kind of stanza. See 'Stanza types' below for more information.
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238 `PAYLOAD` The stanza contains a child with the given namespace. Useful for determining the type of an iq request, or whether a message contains a certain extension.
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239 `INSPECT` The node at the specified path exists or matches a given string. This allows you to look anywhere inside a stanza. See below for examples and more.
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240
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241 #### Stanza types
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242
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243 Stanza Valid types
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244 ---------- ------------------------------------------------------------------------------------------
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245 iq get, set, result, error
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246 presence *available*, unavailable, probe, subscribe, subscribed, unsubscribe, unsubscribed, error
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247 message normal, chat, groupchat, headline, error
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248
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249 **Note:** The type 'available' for presence does not actually appear in
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250 the protocol. Available presence is signalled by the omission of a type.
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251 Similarly, a message stanza with no type is equivalent to one of type
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252 'normal'. mod\_firewall handles these cases for you automatically.
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253
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254 ### Sender/recipient matching
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255
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256 Condition Matches
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257 ------------- -------------------------------------------------------
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258 `FROM` The JID in the 'from' attribute matches the given JID.
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259 `TO` The JID in the 'to' attribute matches the given JID.
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260 `TO SELF` The stanza is sent by any of a user's resources to their own bare JID.
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261 `TO FULL JID` The stanza is addressed to a valid full JID on the local server (full JIDs include a resource at the end, and only exist for the lifetime of a single session, therefore the recipient must be online, or this check will not match).
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262
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263 The TO and FROM conditions both accept wildcards in the JID when it is
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264 enclosed in angle brackets ('\<...\>'). For example:
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265
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266 # All users at example.com
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267 FROM: <*>@example.com
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268
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269 # The user 'admin' on any subdomain of example.com
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270 FROM: admin@<*.example.com>
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271
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272 You can also use [Lua's pattern
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273 matching](http://www.lua.org/manual/5.1/manual.html#5.4.1) for more
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274 powerful matching abilities. Patterns are a lightweight
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275 regular-expression alternative. Simply contain the pattern in double
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276 angle brackets. The pattern is automatically anchored at the start and
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277 end (so it must match the entire portion of the JID).
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278
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279 # Match admin@example.com, and admin1@example.com, etc.
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280 FROM: <<admin%d*>>@example.com
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281
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282 **Note:** It is important to know that 'example.com' is a valid JID on
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283 its own, and does **not** match 'user@example.com'. To efficiently match
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284 domains we recommend defining them as [Zones](#zones).
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285
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286 Condition Matches
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287 ---------------- ---------------------------------------------------------------
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288 `FROM_EXACTLY` The JID in the 'from' attribute exactly matches the given JID
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289 `TO_EXACTLY` The JID in the 'to' attribute exactly matches the given JID
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290
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291 These additional conditions do not support pattern matching, but are
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292 useful to match the exact to/from address on a stanza. For example, if
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293 no resource is specified then only bare JIDs will be matched. TO and FROM
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294 match all resources if no resource is specified to match.
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295
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296 **Note:** Some chains execute before Prosody has performed any
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297 normalisation or validity checks on the to/from JIDs on an incoming
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298 stanza. It is not advisable to perform access control or similar rules
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299 on JIDs in these chains (see the [chain documentation](#chains) for more info).
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300
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301 #### INSPECT
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302
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303 INSPECT takes a 'path' through the stanza to get a string (an attribute
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304 value or text content). An example is the best way to explain. Let's
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305 check that a user is not trying to register an account with the username
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306 'admin'. This stanza comes from [XEP-0077: In-band
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307 Registration](http://xmpp.org/extensions/xep-0077.html#example-4):
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308
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309 ``` xml
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310 <iq type='set' id='reg2'>
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311 <query xmlns='jabber:iq:register'>
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312 <username>bill</username>
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313 <password>Calliope</password>
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314 <email>bard@shakespeare.lit</email>
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315 </query>
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316 </iq>
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317 ```
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318
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319 KIND: iq
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320 TYPE: set
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321 PAYLOAD: jabber:iq:register
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322 INSPECT: {jabber:iq:register}query/username#=admin
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323 BOUNCE=not-allowed (The username 'admin' is reserved.)
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324
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325 That weird string deserves some explanation. It is a path, divided into
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326 segments by '/'. Each segment describes an element by its name,
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327 optionally prefixed by its namespace in curly braces ('{...}'). If the
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328 path ends with a '\#' then the text content of the last element will be
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329 returned. If the path ends with '@name' then the value of the attribute
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330 'name' will be returned.
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331
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332 You can use INSPECT to test for the existence of an element or attribute,
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333 or you can check if it matches a specific value, e.g. by appending `=VALUE`
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334 (like in the example above, that checks if the content of username is 'admin').
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335
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336 #### INSPECT comparison operators
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337
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338 As well as checking for an exact string match, there are some other modifiers
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339 you can apply to the comparison:
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340
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341 Comparison Matches when
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342 ------------- -------------------------------------------------------
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343 `=` The value is exactly the given string.
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344 `/=` The value is or *contains* the given string (e.g. `/=admin` would match `administrator` or `myadmin`).
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345 `~=` The value matches the given [Lua pattern](https://www.lua.org/manual/5.2/manual.html#6.4.1).
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346
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347 Finally, if the comparison operator is preceded by a `$` character, [expressions](#expressions)
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348 will be interpreted in the string following the comparison operator.
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349
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350 e.g. `INSPECT: {jabber:iq:register}query/username}$/=$(session.host)` would match
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351 if the username of an account registration contained the session's current hostname
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352 somewhere in it.
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353
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354 #### INSPECT performance
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355
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356 INSPECT can be somewhat slower than the other stanza matching conditions. To
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357 minimise performance impact, always place it below other faster
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358 condition checks where possible (e.g. in the example above we first checked KIND,
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359 TYPE and PAYLOAD matched what we wanted before reaching the INSPECT rule).
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360
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361 ### Roster
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362
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363 These functions access the roster of the recipient (only). Therefore they cannot (currently)
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364 be used in some [chains](#chains), such as for outgoing messages (the recipient may be on another server).
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365
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366 Performance note: this check can potentially cause storage access (especially if the recipient
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367 is currently offline), so you may want to limit its use in high-traffic situations, and place
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368 it below other checks (such as a rate limiter).
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369
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370 #### IN ROSTER
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371
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372 Tests whether the sender is in the recipient's roster.
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373
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374 IN ROSTER?
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375
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376 #### IN ROSTER GROUP
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377
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378 Tests whether the sender is in the recipient's roster, and in the named group.
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379
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380 IN ROSTER GROUP: Friends
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381
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382 #### SUBSCRIBED
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383
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384 Tests whether the recipient is subscribed to the sender, ie will receive
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385 presence updates from them.
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386
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387 Note that this *does* work, regardless of direction and which [chain](#chain) is
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388 used, since both the sender and the recipient will have mirrored roster
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389 entries.
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390
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391 ### Groups
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392
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393 Using Prosody's mod\_groups it is possible to define groups of users on the server. You can
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394 match based on these groups in firewall rules.
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395
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396 Condition Matches
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397 ----------------- ----------------------------
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398 `FROM GROUP` When the stanza is being sent from a member of the named group
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399 `TO GROUP` When the stanza is being sent to a member of the named group
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400 `CROSSING GROUPS` When the stanza is being sent between users of different named groups
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401
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402 #### CROSSING GROUPS
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403
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404 The `CROSSING GROUPS` condition takes a comma-separated list of groups to check. If the
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405 sender and recipient are not in the same group (only the listed groups are checked), then the
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406 this condition matches and the stanza is deemed to be crossing between groups.
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407
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408 For example, if you had three groups: Engineering, Marketing and Employees. All users are
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409 members of the 'Employees' group, and the others are for employees of the named department only.
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410
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411 To prevent employees in the marketing department from communicating with engineers, you could use
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412 the following rule:
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413
1e1c929c1aa5 mod_firewall: Add and document CROSSING GROUPS condition
Matthew Wild <mwild1@gmail.com>
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414 ```
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Matthew Wild <mwild1@gmail.com>
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415 CROSSING GROUPS: Marketing, Engineering
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416 BOUNCE=policy-violation (no communication between these groups is allowed!)
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417 ```
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418
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419 This works, even though both the users are in the 'Employees' group, because that group is not listed
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parents: 2576
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420 in the condition.
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parents: 2576
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421
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parents: 2576
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422 In the above example, a user who is member of both groups is not restricted.
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423
d637bc0ac604 mod_firewall: Update README for latest changes
Matthew Wild <mwild1@gmail.com>
parents: 2410
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424 #### SENT DIRECTED PRESENCE TO SENDER
d637bc0ac604 mod_firewall: Update README for latest changes
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parents: 2410
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425
d637bc0ac604 mod_firewall: Update README for latest changes
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parents: 2410
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426 This condition matches if the recipient of a stanza has previously sent directed presence to the sender of the stanza. This
d637bc0ac604 mod_firewall: Update README for latest changes
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parents: 2410
diff changeset
427 is often done in XMPP to exchange presence information with JIDs that are not on your roster, such as MUC rooms.
d637bc0ac604 mod_firewall: Update README for latest changes
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parents: 2410
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428
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parents: 2410
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429 This condition does not take a parameter - end the condition name with a question mark:
d637bc0ac604 mod_firewall: Update README for latest changes
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parents: 2410
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430
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parents: 2410
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431 # Rule to bounce messages from senders not in the roster who haven't been sent directed presence
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432 NOT IN ROSTER?
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Matthew Wild <mwild1@gmail.com>
parents: 2410
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433 NOT SENT DIRECTED PRESENCE TO SENDER?
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parents: 2410
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434 BOUNCE=service-unavailable
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parents: 2389
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435
28fbe960adcf mod_firewall: README: Document conditions for groups and admins
Matthew Wild <mwild1@gmail.com>
parents: 2389
diff changeset
436 ### Admins
28fbe960adcf mod_firewall: README: Document conditions for groups and admins
Matthew Wild <mwild1@gmail.com>
parents: 2389
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437
28fbe960adcf mod_firewall: README: Document conditions for groups and admins
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parents: 2389
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438 Prosody allows certain JIDs to be declared as administrators of a host, component or the whole server.
28fbe960adcf mod_firewall: README: Document conditions for groups and admins
Matthew Wild <mwild1@gmail.com>
parents: 2389
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439
2576
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parents: 2559
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440 Condition Matches
95b79d515a65 mod_firewall: README: Document TO/FROM ADMIN, FORWARD, TO SELF and TO FULL JID
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parents: 2559
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441 ---------------- -------------------------------------------------------------------------------------
95b79d515a65 mod_firewall: README: Document TO/FROM ADMIN, FORWARD, TO SELF and TO FULL JID
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parents: 2559
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442 `TO ADMIN` When the recipient of the stanza is admin of the current host
95b79d515a65 mod_firewall: README: Document TO/FROM ADMIN, FORWARD, TO SELF and TO FULL JID
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parents: 2559
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443 `FROM ADMIN` When the sender of the stanza is admin of the current host
95b79d515a65 mod_firewall: README: Document TO/FROM ADMIN, FORWARD, TO SELF and TO FULL JID
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parents: 2559
diff changeset
444 `FROM ADMIN OF` When the sender of the stanza is an admin of the named host on the current server
95b79d515a65 mod_firewall: README: Document TO/FROM ADMIN, FORWARD, TO SELF and TO FULL JID
Matthew Wild <mwild1@gmail.com>
parents: 2559
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445 `TO ADMIN OF` When the recipient of the stanza is an admin of the named host on the current server
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diff changeset
446
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447 ### Time and date
1782
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parents:
diff changeset
448
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449 #### TIME
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450
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451 Matches stanzas sent during certain time periods.
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452
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453 Condition Matches
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454 ----------- -------------------------------------------------------------------------------------------
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455 TIME When the current server local time is within one of the comma-separated time ranges given
1782
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parents:
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456
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457 TIME: 10pm-6am, 14:00-15:00
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458 REPLY=Zzzz.
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parents: 1782
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459
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460 #### DAY
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461
1782
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462 It is also possible to match only on certain days of the week.
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parents:
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463
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464 Condition Matches
4d73a1a6ba68 Convert all wiki pages to Markdown
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parents: 1782
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465 ----------- -----------------------------------------------------------------------------------------------------
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466 DAY When the current day matches one, or falls within a rage, in the given comma-separated list of days
1782
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parents:
diff changeset
467
29f3d6b7ad16 Import wiki pages
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diff changeset
468 Example:
1803
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469
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470 DAY: Sat-Sun, Wednesday
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471 REPLY=Sorry, I'm out enjoying life!
1782
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472
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473 All times and dates are handled in the server's local time.
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474
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475 ### Rate-limiting
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476
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477 It is possible to selectively rate-limit stanzas, and use rules to
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diff changeset
478 decide what to do with stanzas when over the limit.
1782
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diff changeset
479
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480 First, you must define any rate limits that you are going to use in your
4d73a1a6ba68 Convert all wiki pages to Markdown
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481 script. Here we create a limiter called 'normal' that will allow 2
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482 stanzas per second, and then we define a rule to bounce messages when
4d73a1a6ba68 Convert all wiki pages to Markdown
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parents: 1782
diff changeset
483 over this limit. Note that the `RATE` definition is not part of a rule
4d73a1a6ba68 Convert all wiki pages to Markdown
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parents: 1782
diff changeset
484 (multiple rules can share the same limiter).
1782
29f3d6b7ad16 Import wiki pages
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parents:
diff changeset
485
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diff changeset
486 %RATE normal: 2 (burst 3)
1782
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
487
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488 KIND: message
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489 LIMIT: normal
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diff changeset
490 BOUNCE=policy-violation (Sending too fast!)
1782
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parents:
diff changeset
491
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492 The 'burst' parameter on the rate limit allows you to spread the limit
4d73a1a6ba68 Convert all wiki pages to Markdown
Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
493 check over a given time period. For example the definition shown above
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Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
494 will allow the limit to be temporarily surpassed, as long as it is
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Kim Alvefur <zash@zash.se>
parents: 1782
diff changeset
495 within the limit after 3 seconds. You will almost always want to specify
4d73a1a6ba68 Convert all wiki pages to Markdown
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496 a burst factor.
1782
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parents:
diff changeset
497
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diff changeset
498 Both the rate and the burst can be fractional values. For example a rate
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diff changeset
499 of 0.1 means only one event is allowed every 10 seconds.
1782
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parents:
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500
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501 The LIMIT condition actually does two things; first it counts against
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diff changeset
502 the given limiter, and then it checks to see if the limiter over its
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diff changeset
503 limit yet. If it is, the condition matches, otherwise it will not.
1782
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parents:
diff changeset
504
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505 Condition Matches
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parents: 1782
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506 ----------- --------------------------------------------------------------------------------------------------
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507 `LIMIT` When the named limit is 'used up'. Using this condition automatically counts against that limit.
1782
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parents:
diff changeset
508
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diff changeset
509 **Note:** Reloading mod\_firewall resets the current state of any
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parents: 1782
diff changeset
510 limiters.
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parents: 1782
diff changeset
511
2369
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parents: 2360
diff changeset
512 #### Dynamic limits
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
513
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
514 Sometimes you may want to have multiple throttles in a single condition, using some property of the session or stanza
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
515 to determine which throttle to use. For example, you might have a limit for incoming stanzas, but you want to limit by
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
516 sending JID, instead of all incoming stanzas sharing the same limit.
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
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parents: 2360
diff changeset
517
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
518 You can use the 'on' keyword for this, like so:
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
519
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
520 LIMIT: normal on EXPRESSION
2fb11d34087e mod_firewall: README: Update for LIMIT 'on' and document expression syntax
Matthew Wild <mwild1@gmail.com>
parents: 2360
diff changeset
521
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parents: 4235
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522 For more information on [expressions](#expressions), see the section later in this document.
2369
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parents: 2360
diff changeset
523
2370
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diff changeset
524 Each value of 'EXPRESSION' has to be tracked individually in a table, which uses a small amount of memory. To prevent
5fe483b73fd2 mod_firewall: Rate limiting: Document 'entries' and add option to allow overflowing when full
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parents: 2369
diff changeset
525 memory exhaustion, the number of tracked values is limited to 1000 by default. You can override this by setting the
5fe483b73fd2 mod_firewall: Rate limiting: Document 'entries' and add option to allow overflowing when full
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parents: 2369
diff changeset
526 maximum number of table entries when you define the rate:
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parents: 2369
diff changeset
527
5fe483b73fd2 mod_firewall: Rate limiting: Document 'entries' and add option to allow overflowing when full
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parents: 2369
diff changeset
528 %RATE normal: 2 (burst 3) (entries 4096)
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parents: 2369
diff changeset
529
5fe483b73fd2 mod_firewall: Rate limiting: Document 'entries' and add option to allow overflowing when full
Matthew Wild <mwild1@gmail.com>
parents: 2369
diff changeset
530 Old values are automatically removed from the tracking table. However if the tracking table becomes full, new entries
5fe483b73fd2 mod_firewall: Rate limiting: Document 'entries' and add option to allow overflowing when full
Matthew Wild <mwild1@gmail.com>
parents: 2369
diff changeset
531 will be rejected - it will behave as if the rate limit was reached, even for values that have not been seen before. Since
5fe483b73fd2 mod_firewall: Rate limiting: Document 'entries' and add option to allow overflowing when full
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parents: 2369
diff changeset
532 this opens up a potential denial of service (innocent users may be affected if malicious users can fill up the tracking
5fe483b73fd2 mod_firewall: Rate limiting: Document 'entries' and add option to allow overflowing when full
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parents: 2369
diff changeset
533 table within the limit period). You can choose to instead "fail open", and allow the rate limit to be temporarily bypassed
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parents: 2369
diff changeset
534 when the table is full. To choose this behaviour, add `(allow overflow)` to the RATE definition.
5fe483b73fd2 mod_firewall: Rate limiting: Document 'entries' and add option to allow overflowing when full
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parents: 2369
diff changeset
535
2108
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parents: 2105
diff changeset
536 ### Session marking
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
parents: 2105
diff changeset
537
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
parents: 2105
diff changeset
538 It is possible to 'mark' sessions (see the MARK_ORIGIN action below). To match stanzas from marked sessions, use the
573fe9825fba mod_firewall: README: Document session marking
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parents: 2105
diff changeset
539 `ORIGIN_MARKED` condition.
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
parents: 2105
diff changeset
540
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
parents: 2105
diff changeset
541 Condition Description
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
parents: 2105
diff changeset
542 ------------------------------- ---------------------------------------------------------------
2540
d637bc0ac604 mod_firewall: Update README for latest changes
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parents: 2410
diff changeset
543 ORIGIN MARKED: markname Matches if the origin has been marked with 'markname'.
d637bc0ac604 mod_firewall: Update README for latest changes
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parents: 2410
diff changeset
544 ORIGIN MARKED: markname (Xs) Matches if the origin has been marked with 'markname' within the past X seconds.
2108
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diff changeset
545
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
parents: 2105
diff changeset
546 Example usage:
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
parents: 2105
diff changeset
547
573fe9825fba mod_firewall: README: Document session marking
Matthew Wild <mwild1@gmail.com>
parents: 2105
diff changeset
548 # This rule drops messages from sessions that have been marked as spammers in the past hour
2540
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parents: 2410
diff changeset
549 ORIGIN MARKED: spammer (3600s)
2108
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diff changeset
550 DROP.
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551
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552 # This rule marks the origin session as a spammer if they send a message to a honeypot JID
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553 KIND: message
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554 TO: honeypot@example.com
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555 MARK ORIGIN=spammer
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556
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557 Actions
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558 -------
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559
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560 Actions come after all conditions in a rule block. There must be at
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561 least one action, though conditions are optional.
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562
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563 An action without parameters ends with a full-stop/period ('.'), and one
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564 with parameters uses an equals sign ('='):
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565
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566 # An action with no parameters:
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567 DROP.
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568
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569 # An action with a parameter:
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570 REPLY=Hello, this is a reply.
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571
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572 ### Route modification
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573
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574 The most common actions modify the stanza's route in some way. Currently
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575 the first matching rule to do so will halt further processing of actions
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576 and rules (this may change in the future).
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577
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578 Action Description
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579 ----------------------- ---------------------------------------------------------------------------------------------------------------------------------------------------------
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580 `PASS.` Stop executing actions and rules on this stanza, and let it through this chain and any calling chains.
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581 `DROP.` Stop executing actions and rules on this stanza, and discard it.
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582 `DEFAULT.` Stop executing actions and rules on this stanza, prevent any other scripts/modules from handling it, to trigger the appropriate default "unhandled stanza" behaviour. Do not use in custom chains (it is treated as PASS).
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583 `REDIRECT=jid` Redirect the stanza to the given JID.
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584 `REPLY=text` Reply to the stanza (assumed to be a message) with the given text.
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585 `BOUNCE.` Bounce the stanza with the default error (usually service-unavailable)
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586 `BOUNCE=error` Bounce the stanza with the given error (MUST be a defined XMPP stanza error, see [RFC6120](http://xmpp.org/rfcs/rfc6120.html#stanzas-error-conditions).
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587 `BOUNCE=error (text)` As above, but include the supplied human-readable text with a description of the error
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588 `COPY=jid` Make a copy of the stanza and send the copy to the specified JID. The copied stanza flows through Prosody's routing code, and as such is affected by firewall rules. Be careful to avoid loops.
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parents: 2559
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589 `FORWARD=jid` Forward a copy of the stanza to the given JID (using XEP-0297). The stanza will be sent from the current host's JID.
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590
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591 **Note:** It is incorrect behaviour to reply to an 'error' stanza with another error, so BOUNCE will simply act the same as 'DROP' for stanzas that should not be bounced (error stanzas and iq results).
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592
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593 ### Stanza modification
1782
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594
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595 These actions make it possible to modify the content and structure of a
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596 stanza.
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597
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598 Action Description
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599 ------------------------ ------------------------------------------------------------------------
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600 `STRIP=name` Remove any child elements with the given name in the default namespace
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601 `STRIP=name namespace` Remove any child elements with the given name and the given namespace
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602 `INJECT=xml` Inject the given XML into the stanza as a child element
1782
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603
2108
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604 ### Sessions
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605
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606 It is possible to mark sessions, and then use these marks to match rules later on.
573fe9825fba mod_firewall: README: Document session marking
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607
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608 Action Description
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diff changeset
609 ------------------------ --------------------------------------------------------------------------
2540
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610 `MARK ORIGIN=mark` Marks the originating session with the given flag.
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611 `UNMARK ORIGIN=mark` Removes the given mark from the origin session (if it is set).
2108
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612
2114
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613 **Note:** Marks apply to sessions, not JIDs. E.g. if marking in a rule that matches a stanza received
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614 over s2s, it is the s2s session that is marked.
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diff changeset
615
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616 It is possible to have multiple marks on an origin at any given time.
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617
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618 ### Informational
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619
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620 Action Description
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621 --------------- ------------------------------------------------------------------------------------------------------------------------
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622 `LOG=message` Logs the given message to Prosody's log file. Optionally prefix it with a log level in square brackets, e.g. `[debug]`
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623
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624 You can include [expressions](#expressions) in log messages, using `$(...)` syntax. For example, to log the stanza that matched the rule,
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625 you can use `$(stanza)`, or to log just the top tag of the stanza, use `$(stanza:top_tag())`. To fetch the sender JID, use `$(stanza.attr.from)`.
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626
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diff changeset
627 Example:
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628
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629 # Log all stanzas to user@example.com:
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630 TO: user@example.com
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631 LOG=[debug] User received: $(stanza)
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diff changeset
632
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633 More info about expressions can be found below.
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634
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635 Chains
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636 ------
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637
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638 Rules are grouped into "chains", which are injected at particular points in Prosody's routing code.
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diff changeset
639
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640 Available built-in chains are:
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641
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642 Chain Description
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643 -------------- -------------------------------------------------------------------------------------------
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644 deliver Applies to stanzas delivered to local recipients (regardless of the stanza's origin)
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645 deliver_remote Applies to stanzas delivered to remote recipients (just before they leave the local server)
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646 preroute Applies to incoming stanzas from local users, before any routing rules are applied
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diff changeset
647
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648 A chain is begun by a line `::name` where 'name' is the name of the chain you want the following rules to be
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649 inserted into. If no chain is specified, rules are put into the 'deliver' chain.
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650
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651 It is possible to create custom chains (useful with the JUMP_CHAIN action described below). User-created
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652 chains must begin with "user/", e.g. "user/spam_filtering".
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653
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654 Example of chain use:
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655
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656 # example.com's firewall script
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657
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658 # This line is optional, because 'deliver' is the default chain anyway:
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659 ::deliver
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660
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661 # This rule matches any stanzas delivered to our local user bob:
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662 TO: bob@example.com
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663 DROP.
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664
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665 # Oops! This rule will never match, because alice is not a local user,
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666 # and only stanzas to local users go through the 'deliver' chain:
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667 TO: alice@remote.example.com
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668 DROP.
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669
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670 # Create a 'preroute' chain of rules (matched for incoming stanzas from local clients):
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671 ::preroute
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672 # These rules are matched for outgoing stanzas from local clients
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673
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674 # This will match any stanzas sent to alice from a local user:
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675 TO: alice@remote.example.com
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diff changeset
676 DROP.
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677
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678 Action Description
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679 ------------------------ ------------------------------------------------------------------------
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680 `JUMP CHAIN=name` Switches chains, and passes the stanza through the rules in chain 'name'. If the new chain causes the stanza to be dropped/redirected, the current chain halts further processing.
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diff changeset
681 `RETURN.` Stops executing the current chain and returns to the parent chain. For built-in chains, equivalent to PASS. RETURN is implicit at the end of every chain.
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682
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diff changeset
683 It is possible to jump to chains defined by other scripts and modules.
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diff changeset
684
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diff changeset
685 Expressions
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686 -----------
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687
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688 Some conditions and actions in rules support "expressions" in their parameters (their documentation will indicate if this is the case). Most parameters
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689 are static once the firewall script is loaded and compiled internally, however parameters that allow expressions can be dynamically calculated when a
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690 rule is being run.
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691
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692 There are two kinds of expression that you can use: stanza expressions, and code expressions.
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693
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694 ### Stanza expressions
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695
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696 Stanza expressions are of the form `$<...>`, where `...` is a stanza path. For syntax of stanza paths, see the documentation for the 'INSPECT' condition
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697 above.
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698
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699 Example:
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700
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701 LOG=Matched a stanza from $<@from> to $<@to>
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702
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703 There are built in functions which can be applied to the output of a stanza expression, by appending the pipe ('|') operator, followed by the function
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704 name. These functions are:
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705
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706 Function Description
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707 ------------ ---------------------------------------
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708 bare Given a JID, strip any resource
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709 node Return the node ('user part') of a JID
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710 host Return the host ('domain') part of a JID
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711 resource Return the resource part of a JID
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712
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713 For example, to apply a rate limit to stanzas per sender domain:
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714
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715 LIMIT normal on $<@from|host>
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716
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717 If the path does not match (e.g. the element isn't found, or the attribute doesn't exist) or any of the functions fail to produce an output (e.g. an invalid
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718 JID was passed to a function that only handles valid JIDs) the expression will return the text `<undefined>`. You can override this by ending the expression
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719 with a double pipe ('||') followed by a quoted string to use as a default instead. E.g. to default to the string "normal" when there is no 'type' attribute:
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720
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721 LOG=Stanza type is $<@type||"normal">
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722
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723 ### Code expressions
2369
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724
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725 Code expressions use `$(...)` syntax. Code expressions are powerful, and allow unconstrained access to Prosody's internal environment. Therefore
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726 code expressions are typically for advanced use-cases only. You may want to refer to Prosody's [developer documentation](https://prosody.im/doc/developers)
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727 for more information. In particular, within code expressions you may access the 'session' object, which is the session object of the origin of the stanza,
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728 and the 'stanza' object, which is the stanza being considered within the current rule. Whatever value the expression returns will be converted to a string.
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729
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730 Example to limit stanzas per session type:
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731
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732 LIMIT: normal on $(session.type)